The PKI keys are used to decrypt the Keystone revocation list when
PKI tokens are used. When UUID or Fernet token providers are used in
Keystone, PKI certs may not exist, so we now accommodate this scenario
by allowing the operator to disable the PKI tasks.
Since we renamed the variables and removed the old 'docker' variable we
can now collocate container daemons with standard bare metal deployment.
For instance, monitors can be containerized but osds can be deployed
traditionally.
Signed-off-by: Sébastien Han <seb@redhat.com>